R (C) v Director of Public Prosecutions [2020] 4 WLR 158

“The case was concerned with the lawfulness of the measures taken by UK law enforcement to obtain from the French authorities data relating to the so-called EncroChat communication platform, which is alleged to have been used by the criminal fraternity in the belief that such communications could not be spied upon or obtained by the police and other investigation and prosecution agencies. Encrochat hit the headlines when it was announced that the system had been cracked, leading to many hundreds of arrests and numerous criminal investigations and prosecutions …”

ADDED Thursday 7th January 2021